Really nice feeling for game, however there are some suggestions with regards to QOL and improvements.
1. Lack of any options. This results in audio and visual issues, for example in my case it was non-ajustable window and lack of changes for audio.
2. Lack of pause/options menu during gamepla. This is really problematic as to close game player has to go ALT+F4 or close window manually which might be a problem with point nr.1
3. No information regards control, additionally there should be option to revert controls.
4. There seems to be no way to cancel once started jump, even if pressed by accident. Additionally i notice it because i accidentally pressed MMB.
5. It would be nice to add option to look upwards, to plan movements more accurately. Maybe with WSAD or Arrows.
Something unusual i found is that collision for objects is mainly 1-1.5 cm of surface from top. This can result in player sometimes clipping trough image despite clearly touching collision. This is a minor issue however if possible collisions should be extended.
Keep up great work!