i am a huge portal fan. i have been playing for many years so when i saw this i had to try. i am enjoying it , but i think it really needs a save button. i know it has periodic save slots but for me i need more. most of the movements are not bad but i did have trouble falling through the portals. kind of wonky. i also am having a bit of trouble holding onto the cubes. they dont seem to want to stay in my hands. otherwise not bad for a portal mimic.