I like this a lot! Crispy synth, cool beach vibe, nice melody and that shaker got me shaking! Really enjoyable.
I would have liked a little more development. This is stellar as an A section, in perhaps an A-B-A structure where you then introduce a new B idea, even with some different instrumentation in the middle, then you go back and mix these ideas in a third section. As it stands, your tune is just an evolving loop, makes me want more. Then again, actually going through the full Pokemon OSTs there are plenty of simple one loop tunes.
For a mixing nitpick, the intrument coming in at 0:35 is loud! And when it changes chord at 0:40 it lowers in volume and kinda sits perfectly. Instruments be like that sometimes, they give different volumes on different registers. Don’t be afraid to mess with your notes amplitudes or even automation to even things out.