Will you ever add an element of customization to the game? (such as custom image texture for the cloth)

Also, I may have found a bug where you will randomly instantly game over because an enemy is summoned at or close to (within 1-2 radii) of your slime position, causing the required timing windows to be impossible to achieve.

I want to mute the audio for the game, but muting either the site or tab has no effect on the game's audio playback and I can still hear audio from the game even when it is muted. Are you able to add a main-menu option to toggle sound, or do I have to mute the entire system (which I don't want) in order to not hear audio from the game?

Why no playable build?

In fact, the growth rate is tetrational (much more powerful than exponential) if you can buy the upgrades fast enough.

If only there was an endless mode to this game (goal: highest level in 8 minutes, level at game over becomes your score).

Do you mean that the limit is so high that the heat death of the universe (and even the collapse of the false vacuum, see https://arxiv.org/pdf/1707.08124.pdf) would have occurred by the time said limit is reached?

Imagine a marathon race in which out of the hundreds to thousands of participants, you controlled not one, not two, but upwards of fifty runners in an attempt to make them all finish as high as possible.

Or, imagine this: You are a lone zombie in a big marathon race with thousands of participants. The goal is to try to infect as many other people as you can (turning them into more zombies under your control), and to have the resulting zombie horde finish as high in the leaderboards as you can.

If only there was a way for the game to continue past 275,760 AD, perhaps until the end of the universe, and beyond. (Date would need to be stored as just the year, more eras would need to be added, and maybe a second layer of prestige at 10^100 years from now)

Dates are limited to 100,000,000 days before or after the epoch of 1 January 1970 AD 00:00:00 UTC for precision reasons. You seem to be hitting this future limit (275760 AD), causing your date to stop increasing.

The dates stop earlier than that because adding the time per game tick to the current date goes past the limit.

Randomly, instead of generating an image, it instead generates the following error:

TypeError: Cannot read property 'x' of undefined
   at /app/metro.js:424:29
   at Array.map (native)
   at rasterizeLines (/app/metro.js:409:31)
   at generateSegments (/app/metro.js:473:27)
   at tubeLine (/app/metro.js:585:34)
   at Object.tubeLines (/app/metro.js:600:7)
   at tubeImage (/app/server.js:49:23)
   at /app/server.js:143:37
   at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5)
   at next (/app/node_modules/express/lib/router/route.js:131:13)
   at Route.dispatch (/app/node_modules/express/lib/router/route.js:112:3)
   at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5)
   at /app/node_modules/express/lib/router/index.js:277:22
   at Function.process_params (/app/node_modules/express/lib/router/index.js:330:12)
   at next (/app/node_modules/express/lib/router/index.js:271:10)
   at SendStream.error (/app/node_modules/serve-static/index.js:121:7)