Hey there, thanks for playing. I'm glad you like our girl Pherl.
We actually plan to implement an HP regain skill by eating enemies. We just didn't knew how to with the limited time we had. But we will have ready that for future builds, so stay tuned for that.
About invulneravility frames...We have some ideas, we will implement some fixes in following builds.
Jumping down from platforms, that is easy. We can have it done in no time, we just didn't had time to.