this is honestly impressive for your first project AND first game jam! i have a feeling that you’re only just getting started. keep it up! :)
that said, i have a few things to note:
• the sound effects tend to be on the louder side and i feel like having a settings option to adjust that (or making the adjustment manually) would help rectify this and allow a bit more control on that end. other than that, the sounds themselves were lovely!
• your use of theme here is adequate, but as already mentioned, i feel like there’s a lot of potential to have the shell be more integrated into gameplay as opposed to simply being a plot device for the narrative. it kind of just… exists at the moment.
• without a clear tell of how long the waves are lasting, i feel that the gameplay tends to drag on for a while. however, i do appreciate that you added some new variety between the levels to keep things at least mostly engaging throughout!
• on the innovation side of things, i love how the red crab’s weapon upgrades itself over time (even if i do think that the second one of that bunch is a little on the sluggish side, but that’s more of a nitpick than anything) to keep up with the tougher and meaner crabs washing up onto shore. the different properties for the shots was a nice touch too!
• the art was really cute and added to the atmosphere! you definitely did better than you gave yourself credit for, and i think that’s worth something! considering that you also did this on your own, it turned out to be serviceable for what you were aiming to accomplish!