Huzzah homie! Interesting little endeavor you've got here :)
I dont usually like the word balance in a game critique but you may want to look at increasing some difficulty.
I found it interesting enough to get through a couple stages figuring out how things worked etc. By stage 5/6 I was running straight at any enemies I could find and thinking all I needed was enough range to stand still lol
By stage 15 I figured out I have enough range but the homie doesnt stand still between waves. . . lol. . . so more range required.
in the mid 20's im not doing much but shuffling a bit now and again when he wanders too far, by 35 im running into one side while killing on the other side so it is just me choosing bonuses then a flash then more bonuses lol
Good bones here just need some skin and a bit of adjusting!