I can relate. I was writing dialogues just on overdrive mode, trying to make everything on time XD First two days were for mechanics and graphics, which... I guess... We spent too much time on...
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Fortunately for me, I used free assets for the graphics (can't really draw and didn't have any artists available to partner with me) so I wasted most of my time on level design and mechanics.
This was my first attempt at a 2D game too and Unity was helpful until it wasn't, so there was a lot of downtime learning tilemaps for example. I didn't really understand layer sorting so I was a bit confused when I hit 'Play' and the "decorations" of the level magically poofed xd