Like the game a bit rough no music, background, and the fact that you have blank bar in between screen doesn't look safe too cross ^^. But 1 person team Kudos honestly with your own engine.
Completely Mad github repo I'm shock, this SeriousProton seem quite the big project EmptyEpsilon too done with SeriousProton on top of that (not really my type of game, but the task of making that seem enormous). Respect.
Good luck in your projects.