Submarine VS Invaders:

In Brief:
Submarine VS Invaders is a short 2D vertical scrolling underwater shooter using the Unity engine.

You can see some videos of game play HERE, HERE, HERE, HERE and HERE.

The Game:
Submarine VS Invaders boots up to a configuration window where you can select to play in full screen or windowed mode as well as change the screen resolution; and, if you have a multi monitor set up which monitor to play the game on.

The graphic is colourful and as you progress you can return to previously unlocked levels to replay them.

There are ten levels to work through, with boss battles every third or fourth level (see the image immediately below this for details of each boss level). Each successive level earns you an increased amount of cash for example win the first level earn $1000, each increase in level earns an extra $500 except for the last level that earns you an extra $1000.

Your primary weapon is automatically fired. Each upgrade adds an extra gun up to three guns, then further upgrades change the type of gun to a more powerful one. The number of upgrades for your missiles will add extra homing missiles to your secondary attack. The cash you earn for completing a level can be spent in the store where you can upgrade various aspects of your ship and weapons; for example, there's ten upgrades for armour, weapon, missile and engine; plus, three upgrades for a barrier, bomb and repairs to your ship.

You can also pick up power ups while in game that changes your primary weapon into something more powerful. These weapon upgrades, such as the nuclear beam and electric bomb appear to be temporary. Power ups are in the form of letters which tell you what the power up is; please see below for the power up information. All upgrades remain once purchased. Any level that has been completed can be replayed as many times as you wish. To build up reserves of repairs, bombs and barriers, it's a good idea to replay the earlier levels so that you can max out these tools (up to a maximum of three each. Any repairs, bombs and barriers left unused at the end of a level are carried forwards to the next level you play.

On the hood are indicators to show you the damage to your ship (left hand side) with the number of repairs, bombs and barriers you've purchased. On the right-hand middle side is a homing missile recharger. When it's fully recharged you can fire a salvo of homing missiles. When a boss level starts a new indicator appears in the top right that indicates the boss's health.

To use the purchased upgrades use the number keys the bomb, barrier and repairs upgrades use the number 1,2 and 3 keys. The boss battles are quite challenging, initially because I hadn't figured out how to access the three purchased upgrades. Each of the three boss battles have a particular pattern of behaviour that tells you what sort of an attack is coming. Each of the bosses appears to have three different types of attack that include dive bombing and flanking. These two can be surmised because the boss will either disappear along the top or bottom of the arena. (Each boss only uses one of these types of attack.

Controls:

Mouse Axis X & Y= movement
RMB = fire secondary weapon
1 = activate barrier
2 = Use bomb
3 = Use repair
LMB = pause game (need to place mouse pointer over the pause symbol)

Power Ups:

P = Power
E = Electro,
R = Rocket
A = Armour
L = Laser
T = Turbo

Conclusion:
Submarine VS Invaders is a short but playable shmup with colourful graphics and interesting weapon effects. The different levels also introduce different invader types, with three different bosses. If you're not too familiar with shmups, the early levels are reasonably easy to beat, especially if you've purchased various upgrades. Though the boss battles can be more challenging, especially as they have different tactics to the normal invaders.

Scoring:
Game Play = 7.5
Graphic = 7.5
Re-playability = 7
Music = 7
Difficulty = 8
Total Score out of ten = 7.4

Notes on Security
I scanned a zipped copy of the installed game using Virus Total and it found zero hits from 62 antimalware engines. You can see the scan HERE