Nice job finishing your first jam game, I know construct 3 can be a pain to use, I had to make a game in college using the free version and the 50 line requirement was very restrictive (such an odd limitation)! A shame you weren't able to export your project as a web build, but it was still a fun scoring game (my highest was 71). I think the goblins hitboxes could be a bit bigger, there were a few times I felt that they definitely should've hit me and they didn't.
Generally you should avoid using music, sounds or assets you don't have the rights to, you can find a ton of free resources online, at the very least, you should provide credit to things you did not make yourself!