Everybody's got to start somewhere, and with how all-encompassing game dev can be, I think you did well by focusing on a platformer with simple mechanics so that you could spend the leftover dev time trying your hand at the rest (like story, animations, level design, and so forth). The movement mechanics interfered with the jump mechanic, so it's essential to figure out why the WASD inputs stopped the spacebar (did you use if / else statements, or move_and_slide()?).
Good effort! I hope you'll spend some additional time post-jam refining this game and find potential improvements that can help with developing future titles.