For a short Demo of this sort, the game itself was Entertaining, tho it became way too easy, when you realise you can avoid 3 of the 4 normal Enemies entirely, just by jumping onto a platform above ground, kill the enemies and still be within range of getting exp. Basically only flying Enemies and Boss could hurt you.
Overall no FPS issue on my end, the ending scene had an odd camera angle, but otherwise looked fine, but could use a button to return to menu, instead of being stuck in scene until having to forceclose game.
But will be interesting to see what happens in the future with this game.