Nice lil game!
The premise and gameplay loop is very interesting, it has potential!
Tho I would have some critiques, mainly:
- there is a bit too much text at the start. Maybe it could be shortened, or be spread throughout the game?
- the controls are realistic, but maybe a bit too slow (at the same time I don't expect a ship to go at 200km/h tho, for this one I don't have a clear solution)
- I couldn't seem to be able to open the upgrades menu (probably a bug tho)
- the cannon can be spammed, thus annihlating enemies instantly, not making them too much of a threat
But, on the other side, I very much liked the detail put into the cannon shooting mechanic! (the fact it can only shoot from the side you are pointing is really nice, also appreciate the sound it makes when hitting water or land) and I think this has a lot of potential, having 2 different gameplay styles in 1 game!
Anyways, good job for your first gamejam! ;)