I only tried out a few stages (Jolteon, Flareon, Sylveon and Speon, having beat only Sylveon).

The same enemy appears way too many times, but re-skinned as a different pokemon each time; some stages are initially taken straight from an actual MM game, but then it's modified in a way that breaks its original level design; and the one boss that I faced has a cheap move that makes it impossible to predict its next move, possibly forcing you to get hit.

My overall experience was that this feels like all the worst parts of Megaman, but without anything that makes it good. :/