Awesome game! Took me 444 seconds to beat it the first time, but I got it down to 214 the second :)
I really like the sense of scale the mech gives, and scaling it Shadow of the Colossus style was super fun. I especially like how the indirect attack (placing bombs) rather than something more direct like using a gun forces the player into the open and keeps up the tension throughout the game.
Visually, the art direction is solid, and also reminded me of ps2-era games (someone else mentioned Jak and Daxter, which was what I instantly thought of as well). I especially liked the particle effects.
On the audio side, the music was a solid choice, and I really like the "bwahhhhhh" sound the mech made when it took damage. I was a bit confused by what was causing it the first few times, but eventually figured out it was the damage sound. I also liked the metallic creaking and metal footstep impacts when jumping on the mech.
The mech was a little janky to navigate, but I was impressed with how intuitive it was for a game jam release. Also, if you decide to work on it more, I think it would be cool to see the environment fleshed out a bit more.
Overall, a really solid game that took a fun perspective on the mech theme :)