A really cool concept! I liked the inclusion of the merch display in your room, I think this could be quite interesting to expand on should you continue to work on the game (e.g. have an actual room to move around in, and starting the purchasing minigame from a simulated PC).
Two minor things to note: first, the tutorial text was a bit difficult to read, since it was rather small and squished up into the corner of the screen. Secondly, and more importantly, the UI displaying the time and purchased merch was overlapping with the grid of buyable items for me, making the bottom row only partially visible.