The first track is indeed super cool and funky, and definitely a good main theme. I liked your use of chromaticism! This would honestly go so hard with live instruments (especially that bassline and the wind section).
The menu theme is super cute. It kind of reminds me of the map theme from Castle Crashers, which I personally think has a great OST.
The overworld theme is super unique! It's pretty jazzy, I could imagine it being arranged for big band, and sounding awesome. It's also a really cool take on overworld themes, which I always imagine as being super dramatic and this was kind of out of left field for me, but it's great!
The battle theme I could absolutely listen to just for fun. Again super funky, but also really energizing and fitting for a battle theme. Also, the kind of 'improvisational' flute solo is awesome. Probably my favorite track!
To be honest, the only reason I think could make someone not want to listen for this just out of sheer catchiness is the 'production' (in this case, mostly the digital instruments' sound). It works for a game jam, but if you could - and I know not everyone has the ability to - get some better 'gear' (DAW, VSTs and etc.), I think anyone who would hear this will immediately get hooked.
Despite all of that, the sheer quality of the composition is visible and stands for itself.
Great job!!