Visuals
1 ... aesthetics fits together +1
2 ... (main): add animations -> now it feels static
3 ... add player feedback on button hover
4 ... smooth GUI animations when it appears:
4.1 . example: simple opacity bounce zoom
Design
1 ... interesting design:
1.1 . is this astronaut throwing frisbee?
Controls
1 ... works
2 ... movement is little to fast (you start at 0 -> then max 3x run speed)
Sound
1 ... good +1
2 ... might feels repetitive if you focus on sound otherwise not
Bugs
1 ... (visual): alpha doesn't work where tile ends
2 ... (visual): moving speed & animation speed is of