Nice game! The shooting and particles were good. Movement was sortof hard. Maybe mapping to a game controller could be better. The sound effects were a little piercing on the ears. I only beat the twins because I ran out of money to fight anything else and did not want to beat them over and over again. Maybe you could make it so there are 2 paths, one where you either go one by one in a specific order and another where you can use money to fight ahead and potentially win money. That way if you win you have a way to instantly fight a new boss but also have the option to jump around if you are good enough.