I can appreciate tgia game for how they implemented Bass being playable, making him way different from Rock but at the same time with his own strenghts and weaknesses, not only that but also the art managing to match a psone game, although being honest, for how detailed the sprites are, they look a bit uncanny with how fast they move thanks to not having as many frames of animation as mega man 8.
However what absolutely kills this game is its design, its not just the bad level design, its not just the unbalanced difficulty and how some stages and boss fights dont feel like they were fully tester with both characters, its how the game itself feels badly designed, itema being usable only one at a time forcing you to constantly pause the game to switch the upgrade around, absolutely killing the pace, some items seemingly having omissions on how they work like how the half damage one doesnt seem to work on bosses, the lack of sub tanks taken from mm8 ignoring the fact this game's level design and checkpoint approach is not as forgiving as that game's to justify said omissions, and the hellish marathon that is the endgame stages, which just make all issues above pop out even more.

Overall cannot really recommend, maybe if you want to see how bad it is, sure, but even then just go with Bass to save yourself some frustration