It's not bad, but it's not great. Watching the Selfs bounce around is quite fun and some of the upgrades were pretty useful, however:
1. I wanted a reason to increase facets beyond just "it's how you win the game". Why not give me certain bonuses depending on how high they are? Or something special for maxing them all out (at the current cap)?
2. The cap has no indication when or why it increases. I can only assume it's based off the total number spawned, but I wouldn't be able to even guess how many corresponds to the next 10% increase. I almost quit at 50%, saw what got unlocked then (nothing too interesting), and dropped after getting 60% in everything. I would've at least tied progression to the user maxing all the facets in some way.
3. A lot of the automation doesn't scale well with the increasing Self cost. I would've loved to upgrade that 2 energy for 0.1 selfs/s to like 20 for 1/s. 63 energy/second means it's still a long wait to the next Self at over 8k.
I can see what you're going for, and it's a good base, but I think it needs more upgrades and better reasoning behind the facet cap. With further development, this could be great!