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3440x1440 does not appear as a selectable resolution in the starting list of options.

Run without Compile --> Exit the game once it starts --> This error message:

It then left the screen at the incorrect resolution, and I had to manually go reset the resolution in Windows settings. 

I was running it at 2560x1440, with my default baseline monitor resolution being 3440x1440.  Sounds like it couldn't return to regular resolution after exit.

Two comments:
#1 - I think you should consider scaling up the resolution that the player selects, instead of just scaling up the background.  It looks not good in modern monitors.  Example at 2560x1440:  https://i.imgur.com/Yjt8BVz.png   It is doubly-jarring for anyone on ultra-wide, but as they are not a highly-represented population in monitor studies, not a big deal. (I use 3440x1440, but I am part of a mere 2.85% so am not relevant.)   The August 2025 Steam Hardware survey has 1920x1080 monitor resolutions making up 54.4% of players, and 2560x1440 making up another 20.2%.    Here is the relevant section:  https://i.imgur.com/wkxDJop.png

#2 - Upon exiting the test run to show what it looks like at 2560x1440, it did not put my monitor back to its normal resolution.  It instead popped an error message that it did not support that resolution and left me to go into my monitor settings myself.  That part is very, very much not OK for players to have to do every time they run a game.  The error told me to contact the developer, so here I am! :D

Hello!  I just wanted to say thanks for building an engine like this.  Crawlers/blobbers are awesome and remarkably underrepresented in "easy" dev tools.  I've purchased the premium version to support your dev work.  Best of luck to you with growing this engine, and I look forward to seeing how it develops!