Hard!
This game looks really neat, I dig this kind of glitchy art style, and it also sounds cool.
It combines two games in a potentially interesting way, but while the block placing half of it is inspired by Tetris,it is also very much different enough that it I felt that I didn't understand it at all adequately (how do you remove a "line" when there's no well to fill?). If you then layer a platforming experience on top of that and a visual style which looks good but... sometimes makes it hard to read what is going on, combined with the fairly complex controls that follows from playing two games at once, you get what I felt: Confusion.
I watched the dev play and that sort of confirmed two things:
- There is a potentially cool game here, for those that spend enough time
- Watching a good player play the game did make some things clearer, but for the casual observer it _still_ looks overwhelming
I think there is something to your game which good players can really enjoy, but you do have a problem getting people over the hump to where they enjoy playing, preferably within the first couple of minutes. Some things that one could possibly consider:
- Can you, in a decently natural way, teach the block game separately? Then ask the player to start controlling the character once they feel comfortable placing blocks and the rules around that.
- Maybe one can start with no wall of death at all?
- Reduce the visual chaos early in the game and ramp it up as you go, making it easier for novice players to see while still preserving the visual identity.
- Tie more of the visual effects to player actions, i.e. use them as feedback.
In addition to the challenges above it should be mentioned that I have a slightly different challenge tied to my particular setup. I don't currently have have access to my gamepad, and my keyboard layout is non-standard in a way that doesn't work at all with the standard mapping (in a Kinesis Advantage way). I remapped it to be able to play at all, but when you don't know how to play properly it gets very hard to figure out a good keyboard mapping.
I haven't mentioned the fact that from a technical PoV this game feels like a complete and polished package, it just works very well with no fuss, which is absolutely not something you can take for granted. So good job, if you just figure out how to onboard new players, I think you potentially have a winner on your hand! Good luck!