Tried the demo. Only spent 10 minutes on it but my first impression is so terrible that I'm not going to spend any more time on it, much less money.
The controls suck. There are three control schemes but all of them are awkward and you can't change them. Please I would like to use a control scheme that makes sense, like arrow keys to move and ASD to jump/attack/charm.
Combat feels pretty bad. The short attack range and stiff movement make positioning cumbersome, and the involuntary movement when performing combos is something that should not happen.
Double-jumping is bugged, as it seems to be based on time rather than touching the ground; if you hit your head on a ceiling or land on a platform higher than where you started and jump when you hit the ground, it'll count as a double jump. This already got me in the tutorial and this does not bode well for the actual platforming down the line.
When I landed on the spikes and died instantly, selecting "continue" made the game softlock.