Really neat idea with very good post processing polishing, I feel like movement with a fix camera where it is currently, indicators of where an enemy is coming from and borders to stop the player from leaving the camera pov would be really quite good but other then that this game is really well done,
The atmosphere created here is really nice and the player having to buy back lives is a good idea because the player has to judge whether or not they can afford to buy a buff or not so well done for doing that, good job on this and good to hear you going to continue on this!