I'm sure you'll do better next time. I had some issues with my game too given that this was my first real jam too. (did another one in school but it was only 8 hours) Next time try to team up with an artist (look for conversations before a jam or check out that crowdforge thingy) and i'm sure you'll do beter. Oh and also don't forget to never give up because your games will get a lot better with time (you probably heard this a lot but I still hope it gives some encouragement :D)