Nice game! I struggled to get past the first boss initially, but once I got the hang of it I felt the game was nicely balanced. Was also pleasantly surprised to find more levels. Loved the different environments, especially the cowboy ambush with the SFX added on top haha.
It would be cool if grazing recharged your attack bar (like a risk vs. reward kind of thing), might be tricky to balance though.
All in all I had a lot of fun, great job :)