This game looks good and sounds good and its pretty enjoyble, great job!
I suggest the following:
-Player gets hearts somehow(add a chance that an enemy can drop a health regeneration potion or something/or maybe regenerates after awhile)
-Different weapons (maybe a shop to give a player goals to achieve)
- Some helping creature representing your subconsious mind deafeating the troubles with you
Thats all :) Thank you for making this awesome game!