Not gonna call this a post-mortem, literally anyone can make the player move around looking for stuff in a couple of hours using Game Maker. I do, however, wanna share why I made Oshan and how I retained my sanity after I scrapped my original idea.
The original idea:

Before you ask, no I won’t go back to this for the foreseeable future.
I wanted to make a “Underground Moé First Person Shooter” — I did my best, I swear.
The first day went on to get 3d to work on Game Maker, went pretty good but could not get a nice camera wobbling nor a satisfying shooting. It was kinda ambitious, in the sense that I’ve never, ever worked with 3d before I mean, I come from making Visual Novels for god’s sake, even a platformer would be a pain in the ass for me. I was confident I could do it but I wasn’t having fun and the game did not felt good… it even gave me headaches and stressed my soul in more than one way.
After wasting one day and a half on this failed execution of an idea, I fell on my bed, and thought.
“I need to relax… I should make a game to relax”
“What’s relaxing to me and is beneath the surface? ooh! floating underwater…”
“What if I make a game about just finding funny stuff under the water?”
And that’s how Oshan came to be.

This is what caused Capc*m’s demise.
The original idea with Oshan was to make this cute, colourful sea explorer — you know, blue oceans, different kind of sea creatures, the usual stuff, but I have quite some time getting around the idea of a series of games that are built around a “Peaceful End of the World” — stories that are not about survival, but about finding what made humanity and our civilization so beautiful before we destroyed everything, so I decided to take a monochromatic approach to visuals to get some desolate ambient going on, in the vein of a modern Game Boy game and try to make the items you can find the weirdest things I could think of. Now, most of the items I wanted in-game couldn’t make it since I did Oshan in approx. 6 hours and I was already incredibly tired due to my failed FPS attempt, but I’m satisfied about the ones that made it. Talking Octopi, sunken game corporations and mysterious talking clothing were, at least in my mind, a combination that basically said… The world just kept going without humans, but our blueprint is still here.
Yeah yeah, not very beneath the surface apart from the fact that the game is underwater, but in reality I just wanted a game to relax myself, it was boring to me, but I didn’t cared, somehow just wandering around got me in a very good mood, almost therapeutic and can’t stress how much it worked for me, it made me realize that whenever I want to have a game idea, I just need to see myself in the mirror and ask “what do I want to feel?” the rest will just follow.
Good! so, that’s why I did a cute but boring game. I’m very happy with the results! but I’m going to work hard and use the knowledge I gained from this LD to make cute AND fun games that can also make me feel how I want to feel when the time comes, and you should do so as well, make a game about how you want to feel and the rest is just like make game.
Lots of people said I should flesh out more this idea, and might do so once I get some work done on my current project or maybe after the Space Cowboy Jam, I liked Oshan enough and want to make it even more relaxing so I can play it whenever I feel bad.
Edit: forgot to link the game! Oshan, my compo entry lives here.