I see! I tried seeing if bombing it several times in a row without dying did the trick, but I guess I never reached five times.
I think giving the boss a new expression for each HP (or maybe a growing crack in its face) would be even better, but an HP counter would be a big improvement for making it clear what's expected of the player.
*e* the completion animation is very cute.
The boss is hard but fair once you know how it works, although I do have a few issues;
- The bombs take a long time to respawn, so I spent a lot of my time just running in circles to pass the time, which wasn't very interesting - I got tired of the running SFX very quickly.
- some spawn points of the boss are much easier to reach than others from the running-in-circles route, meaning you could randomly have a much easier or harder time with the boss depending on which spawn locations it picks. I had one attempt where I hit the boss three times in a row without needing to change direction.
In room 11, my first solution to the new switch was be to just activate it and wait it out, rather than sliding under it - putting a block or spike that you have to slide under instead would require players to do the slide without giving them the chance to just make the level more boring for themselves in easy mode.