Changes:

Updated a bunch of rooms to make better use of the oxygen mechanic and fixed a tiny issue regarding this mechanic.

Added ability to enable or disable in-game achievement popups, also fixed another tiny issue regarding achievements.

Removed the projectile limit for standard player projectiles for now to test it out long term.

Supposedly fixed most "player can shoot through walls" issues.

Dropped items (energy, ammo, etc) now stay for 5 seconds then start blinking, explode and disappear.

All dropped items now flash white. (only missiles did before)

Fixed player projectile collision issue with special tiles.

Shooting a charged beam at special tiles now reveal their true form if it doesn't break.

Added two new special tile types.

Created a new tileset for use in a new zone and began work on that new zone, also updated the world map with new areas.

Fixed some minor issues related to particles.

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And as a final footnote, just to let everyone know:

Achievements will be staying in the game based on feedback and more of them will be added later.

Also, I've had a headache all day so I can't be bothered making a new gif to showcase (also why I'm this posting this a bit early), so I put some of the new updated screenshots here instead.

That's it for now.