Very good! The controls (and in particular the jump) felt great, and I liked that the inverted evil twin a different mode, not just the direct mirroring bits.

The level design was also well done, and the introduction of mechanics were nice and smooth.

I would have liked to see some more interesting interactions with the inverted self mechanic; e.g. using the evil twin to open something, or more modes to keep you on your toes, stuff like that. 

But overall, this is just an excellent platformer; well done!

This is a fun little platformer, the movement feels really nice especially the varying jump heights!

Hello! Everything is great on this game except one big part.

There is no effects, squash and stretch, screen shake, particles etc...
It is well done, the  level design is cool and the controls are easy to handle.

Great job, next time work on the effects part and good luck!

This is the first time I've played a PICO-8 game and I love it! Super sharp controls and graphics are simple yet effective.