Great game!!
The gameplay movement is excellent, I was able to move the character and shoot the enemies with fluidity.
The music fitted well for the theme, and the sounds are good.
I think that the introductory music could be a bit lower, and the stage music start only after the introductory music ends.
The level design is very good, it was cool to explore the stage!
I liked the variety of items and the little invencibility for the character when taking damage.
Perhaps the enemy's bullets could be a little slower, to have more time to dodge them when caught in surprise.
The art brought the essence of the MS Paint well. The elements are simple and well drawn.
I noticed a problem in the mouse movement. If I move the mouse to one direction and then drop it, it continues to move slowly towards that direction.
The mouse can't reach the close button of the game window too.
Congratulations for the game!! I enjoyed it a lot, and will stay tunned for more updates! =D