Yes, the spacebar would be nice!
I think I finished level 3 and was on level 4. I usually try to finish all the games I play before rating them, but I have been a bit pressed for time, so it was hard to dedicate further time to playing.
I see, now I understand the rationale! Hm, I think perhaps what you could implement is a 'sixth sense'. This will put a little directional circle when enemies are in a certain proximity, pointing out where they are coming from. This allows the player to slow down and avoid being ambushed. The other reason I pointed it out was because one of the things that killed me most often was the dashing the ghost does after getting enraged. When they have more health than expected, I would often take unexpected hits.
In regards to level design, checkpoints after unlocking each 'wing' would probably make each level a lot more manageable, that would be nice to have :).
And your post seems fine to me, I think because I posted such a long feedback, you replied in kind and that's fine :). It gave some interesting insight into how you developed the game, thank you :).
Hope to see your game develop further, it is fairly fun.