Even tho I can't play it because I don't have Roblox, here's my short review of the game based on the gaming stream:
The game looks very much playable although it is only a demo. It has seemingly very tight and responsive controls, could really make for a very fun platformer. Also this game would def shine on a platform like Roblox where a good portion of games are either bad or just weird, so even if it isn't that accessible, it'll likely get a ton of positive attention eventually if you keep on working hard on it.
TL;DR: It's a promishing game.