Honestly really great. I love how you took this genre and added tank controls. I think it's awesome you had a solid progression system in a jam game that made me want to keep replaying it. I think the real thing here if the focus on the gameplay loop and really not adding any fluff that is unnecessary.
The art is really consistently well done. Everything feels really well designed, I genuinely think that's hard to do in a jam game and especially with this high quality! Even the animations are consistently styled.
I think the mech building mechanic is really cool and how the head and legs have some similar values and expands more on flexibility of playstyle rather than being forced into one playstyle based on leg choice for example. I personally really enjoyed the frog legs and the high mobility, but being a weapon of a mech was pretty fun too.
Really cool game and I loved the background music.