This is very well programmed. I'm impressed by the amount of options and customization. That's cool you have several variations of the same OST with the different sound sources. The sprite-work definitely looks like a real arcade game from back in the day. I'll have to try this with a second player at some point.

The drawn art can be odd looking but I think it gives the game a charm. I'm a self taught artist myself, perhaps that's why I feel that way. I respect your passion. Keep doing what you're doing, man.

Since you like shooters, you might be interested in my project called Coma State Eden. I submitted it to a big contest and the voting is still open. If you're up to it and would have some free time, check it out and give it a rating/leave your impressions.