Not bad for a game in just 2 days 😊!
Gameplay
As explained in your devlog, it's nice to be able to unlock a new ability each time and then use it immediately and get further and further. Handy to see & discover what you can do after each star.
Level structure is also nicely made. The controls were a little less easy in my opinion. The wall jump was not very smooth. Wall jump is always a difficult move to get smoothly.
Would have been nice if there were more levels and abilities. I understand that this was not possible within this time frame but maybe for a future update😉.
Graphics
Solid pixel art. Animation of the main character is nice. Some particle effects when walking or jumping could give some more polished look.
Audio
A background track would have been a good addition. Especially in a retro 8-bit classic style 😁. Matching the art. Walking SFX is good, but an effect at jump would also have been a welcome bonus for example.
Theme
Upgrading your abilities fits the theme well!
Devlog
Nice devlog with how you had in mind to make the game and setting up the levels. Also some pictures to clarify. Cool!
Short game but a fun one and I think a good foundation, in 2 days, for a somewhat longer game 💪.