This was a lot of fun to play. The character feels really nice to control with those wall jumps and the fast speed. At the same time, that fast movement could make it somewhat frustratingly hard to hit the buttons and not just go right past them. Maybe an increased hitbox would have been a little nicer? ^^
The narrative intro was really cool and gave me Undertale vibes with that dog :D
I feel like you could switch the level order around a little since some of the latest leves felt quite easy compared to earlier ones.
Overall great entry. Very impressive that you made it in under 20 hours and with no team!