Fun, simple, straight to the point, takes time to learn, difficulty curve rises at an appropriate rate makes you want to try again each time differently.
Only issue found was in the system response of item pick up. Item becomes highlight pressed space bar multiple time for the pick up to register. Tuning that mechanic to become more responsive would allow the game to grow at an appropriate rate becoming near the end fast passed and intense.
Overall, well done polished, working, and fun to play!