1) I absolutely dig the music. It's boppy and adventurous without being too mind-numbing. 2) I like retro graphics and the like, and graphics don't make or break a game for me, but I feel like you need to commit a bit harder to an aesthetic and find a way to streamline it. 3) I like some of the mechanics that you put in, like the wall-climbing, but I'd like to be able to duck, and I'd like the control to be tighter. Some of the enemy placements for the introductory level are on a pretty high learning curve for just getting the feel for the game, and that gets a bit discouraging. Otherwise, I look forward to seeing how your game creating develops over time.