First game jam! Besides some shitty games in rpg maker (They shall never see the light of day again) first time making any "real" games. Any tips?

Make a playable game first. Then add polish/finish after. Always have a playable game.

And always downsize. Downsize a lot. 

Its my seconed game jam so all I can say is INCLUDE THE .DLL FILE

im very stupid

Keep it simple, do a bit of planning before jumping in, focus on having something playable as early as possible, don't be afraid to scrap it and start over.