I liked the fact that the game starts slow but gets faster fast. The variation in the obstacles and enemy types is good and really appreciated for this kind of game. One MAJOR issue is that the game lags when the gun gets too powerful, either fast or lots of bullets, object pooling should have been implemented. The controls have redundancy (shoot with "space/LMB/w") which is not the greatest for the given prerequisite. If not for those issues the game's graphics are really good, the sound isn't annoying but gets you focus instead, moving the spaceship feels smooth and the gameplay is fun. I would love to have a leaderboard here. Really good game. Well done!
Edit: I just saw you edited the game outside the 46 hours time period. It's against the rules. It's not my job to make people respect the rules and if you really changed a line of code I think it's fine but just watch out.