Stage 3-2 was the most annoying, since it's quite hard to keep both a blue and purple shield combo ready constantly.
RNG made me lose a couple times (and I reset a lot at start if I didn't have an instant blue shield combo)
The last stage was definitely really well made. The player's given just enough time to prepare a double shield, and getting rid of the calcined blocks, while being an extra threat, is still not overwhelming.
There's nothing left but to have a bit of attack combos ready at the right time, and here goes.
Really had fun on this lil' game, I personally prefer this level-oriented progression rather than infinite arcade, but such mode could be a good addition if this game has any future plans :D