Awesome, you did so much in so little time, congrats, It was a cool short game. Here are some recommendations
- Make the obstacles that hurt you the same color always, that way you can communicate visually what hurts you and what doesn't (for example you could make all your spikes red and turn the red obstacles to green or vice versa)
- Make a background for the pause menu (a UI image should work) so it's clearer that you opened a menu
This are just recommendations and ultimately you decide what you do with your game. Congrats again !!! :D
(I had the most fun with the last level because it was the hardest to beat)