Hello Kiyoshi!
Glad to hear you loved the demo!
1) Adding a dot for minor items and circle for major items on the map.
That will be in the next update coming soon, I've already added it to the game it's just not released yet.
Although it's just a empty + sign for items not acquired in general and a simple dot sign for when they're acquired.
2) Make wall jump a power up to prevent early sequence breaks.
I would but having seen so many people playtest and not realize it exists led me to not putting it as a separate ability.
There's also the fact that I feel like that would just be padding out the abilities needlessly. The game doesn't explicitly tell you at any point how to do it or that you even can do it.
So for sequence breaks I'd say it's fine, it's more of a level design issue honestly. Since this is just a tech demo instead of an actual game demo I wouldn't really worry about it too much.
3) Rest of game when?
I work on this entirely in my very spare time and on a shoestring budget so it might be a while.
I'm aiming for the final Tech Demo 3 update to be released roughly end of July, start of August, which will contain a lot of updates along with the game's name reveal. After that's released I'm looking to start working on the actual game, which would mostly be work on levels, enemies, and audio since most of the player mechanics are done at this point.
Currently I'm applying for a game development grant to be able to potentially work on this full-time for a while, but there's no guarantee I'll get it.
4) Future randomizer.
I'll think about it, thanks for the idea.