Decent game, but I'm noticing a few issues. Firstly, it's really annoying to have to click every time you want to start a level. Secondly, when you lose a level and come back you have 2 hearts instead of the maximum 3. Lastly, on level 2 there is a desk which keeps damaging me. I'm not sure if this is intentional or not.
Edit: I also found a glitch where you can jump before a level starts, moving you way above the level, meaning that you can skip major sections of a level.

Hey, Dr. Ludos! You might remember me from Itch.io. I'm glad to see that you are also putting out content on Newgrounds!

10/10, game of the year