The game is so great! Enjoyed a lot it in many aspects, gameplay is fun, music and animations are tasty(wow so many palettes). Small touches like messages when you hit bosses, win screen with "you did it" are just wonderful!
My other thoughts - only major drawback for me personally was acceleration - so character has impressive inertion which makes Teabat blast through everything so fast you barely notice what's going around(and it gave me a little of dizziness as well). And even despite that I rushed through levels due to it (kind of cuts away desire to explore all those hidden locations tbh), it took me somewhere around 30 minutes and my score was E(maybe not enough of teacups/pots collected??)
Are stats on the left number of teapots or achievements(if so what does it mean?), as you can see same on the right? Also I didn't find any use for echolocation (C key), is there any? It seems like it can't hurt enemies at all. Button layout generally is a bit unclear, guess I even missed explanations if there were any(aside "Press A" which is Z key apparently for some reason) Steam Knight boss design is somewhat confusing (guess I get it? You gotta have the level inside of it?) but placement of boss parts is complicated. Didn't understand how tree/tower areas work since there's no way to get further than entrance room it seemed.
But generally this game is very nice, notable usage of many realtime animation visual effects/platformer mechanics, sounds pop and collecting cups is amusing, thanks for instant revives and saving stuff with you when it occurs! Good luck on continuing this demo to full lenght!!!