Being able to have different starting points was nice. The collection and colour of the elemental pickups is also satisfying. The empty spaces where circles could be in the element tree looked like there might be more upgrades to unlock, but combining the tier 2 elements didn’t give me anything new. Played a couple times.
There’s no real indication for when you take damage other than your health bar going down, so it can be hard to gauge how close to enemies you can get away with. It’s hard to say how valuable any of the upgrades apart from pickup radius I and the center one is.