Not so good:
- The level derived from the test tube and you can tell pretty quickly that they are repeated.
- The opponents come from the retort - attack patterns are copied, so that by no later than 10 levels perceived only visually new is coming.
- The game is easy: attack patterns are quickly seen through and locked. Boss battles were definitely too simple and short (except the last boss). Dying to do in this game, only to confined spaces or merciless overconfidence at multiple opponents. The puzzles (hidden areas) are a little arg obvious to solve.
Conclusion: Technically you can not fault the game. The design's proven old. Only the implementation is frankly not so successful. It's okay for a lunch break or a ride in the subway. But as a real game, it is not demanding enough.