I made all the pixel art for the game, which is not something I tried before, but I became a big fan of it. I also learned a lot cool new programming tricks while making the game. I uploaded the different developemental stages as I went, and they can be found here, in case someone is interested.
Screensaver seal
Here I just started figuring out how the html canvas works, and how to use spritesheets for animating characters. You can already move with the arrows.
Seal with fishes
I added several independently and randomly moving characters. You can collect the fishes.
Colorful fishes
There are several different fishes (plus fishs sticks, Little Seal's favorite), they move with different speeds and have different values.
The points are counted here.
Background
Basically same as the previous one, only I added a background. This backround was an awful lot of work. Fun fact: it's not on the canvas with the other elements of the game, it's a roughly 80 frame long gif, positioned exactly behind the transparent canvas. Is this the best way to solve this? I have no idea, but it works.
Enemies
The enemies and the healthbar are in the game, and the Little Seal turns red when he interacts with something dangerous. But nothing happens yet if you lose all the healthbar.
Levels
The levels are added at 250, 500 and 750 points, you win at 1000 points. The other plushies me and my siblings often play with make cameos here. Little Eater egg: if you press "p", when Little Octopus appears, she will turn grumpy.
Little Seal Adventure
The finished game. It has many-many minor updates. I styled the whole site, added a pixel-font to it, made an info-panel and added music (now you have to click anywhere to start it, because most browsers disable autoplaying music). There are several little icons for the music and the info, and also for pausing or restarting the game, and these also have keyboard shortcuts. I also added magic items you can catch. And finally the game has a proper ending, you either lose all health and the seal swims out disappointedly, or you reach the seal-fairy who gives you pickles.