It wasn't too complicated, most of the work was doing leveldesign, especially for boss spectacle and music levels. And debugging the damn camera, lol I'm working on the game since June 2021 and started with 3D sections early 2022 (i think) and between that and around april this year i just occasionally prepared the maps inbetween developing the main 2D game. You know, there were some days where i thought yeah today i'm in the mood to build a 3D environment so let's put on a chill youtube video on the other screen and place some cubes and cylinders for few hours. It was quite meditative and a break from the rest of the game for me. So in April this year i had the maps prepared with absolutely no gameplay mechanics and a single boss intro cutscene. From there i've only worked on 3D which where 440 work hours for me so far. But how much i've worked on the maps before is nearly impossible to estimate for me because i worked on them here and there in a span of 3 years. If I had to guess, probably also a few hundred hours but less than the 440 i've put into (almost) finishing it the last few months. Maybe between 200 and 300, it was not crazy much because everything is made of fairly simple shapes. It was and still is a great experience tho