Thank you for the feedback!
Here are my considerations as the developer:
Both games are built on trial and error. Since it doesn't have a lives system and stages are pretty short, it's pretty inconsequential. You're supposed to die and memorize, it's part of the challeng and it's by design.
But I'll consider the bosses having an idle phase, it seems fair and one of them had prior to me cutting it from the final version deeming it too easy lol