Absolutely amazing game! The grapple mechanic is really fun and easy to understand with clear use of colour to indicate the grapple points. The level design is spot on and it's always clear which way to go and what is a hazard, and the checkpoints are also really well placed. I love the music and SFX, and all the pixel art too, and the UI is perfectly implemented. Adorable character design and great interpretation of the them. A truly impressive feat for a solo entry! You even have cutscenes.
Tips to improve even further: There is one or two points where the grapple points you need to target are off camera or, right at the top. Polishing the camera system to offset a bit and show these areas better, or tweaking the level to lower the targets would get around this. I love the timer addition too, I'm already addicted, chasing that perfect time! Although the timer doesn't reset between plays and requires a restarts. I also personally love the challenge aspect, but adding a larger collision radius around the grapple points with a subtle lock-on mechanism could make it more accessible.