This is my first time playing a matching game/puzzle like this, that being said, lots of fun!
The art is adorable, and I love Derpy and the Doc's little victory dances.
The music is comfy, and has some nice variety, too. Reminiscent of some of my favorite childhood games. (Are some of them final fantasy themed?)
The game itself was great, and got a bit challenging near the end, too! The last few levels are a little tricky~ (the last 5 or so in particular. My noggin was definitely stimulated, hehe.)
(I played without the ceiling drop/auto fire mechanic my first go around, may go back for a high score playthrough later. Good luck beating Derpy's score.)
I didn't end up finding the secret level builder. Maybe thats what I'll look for next.
Despite not playing one of these games as a kid filly, it certainly made me feel like one again.
Overall, highly recommend Derpy's Bubble Puzzle. <3