I played the game for a good while, and finally managed to make it to the top of the level with the button thing. Not sure if that's the easter egg you are talking about. I think the game is currently a bit barebones right now, but could be improved and be much more enjoyable with some further work. But at least the vibe is really cool and I like that a lot.
Other things I like:
- Platforming is pretty difficult but still fun. I think the game could pivot instead
- Music choice is cool too. Got that old 2000's game vibe
Suggestions:
- Consider slowing down and adding attack animation for the enemies. It feels like a unfair when some enemies just jump at you and immediately get killed. This is especially true in the small room under the staircase
- Run jumps feel a bit slippery and hard to manage, especially with the small platforms. I would prefer snappier controls instead
- Maybe adding a health bar and auto-healing after not being damaged for a while? 3 - 4 hits only felt a bit harsh
Anyway, I think you still did a good job in making the game! Keep up the good work!