Sorry for all of that confusion! - I probably didn't spend as much time as I would've liked to on feedback and a sort of "tutorial" - it kinda just throws you in
Now that I look back at it the fire pellets description isn't that great, since it makes it seem like if a fire pellet is shot by fire again it gets multiplied again, but it actually doesn't (as a matter of fact there's a bug in the game that actually makes it just set it back to a regular pellet again, whoops - it's supposed to just stay as fire)
The speed up by boosters actually isn't multiplicative, it's additive, because behind the scenes the ball has two speed values; the base speed and the bonus speed, and boosters just add a set value to that bonus speed.
Also, on the topic of the ice and gravity pellets, I never actually included it in the descriptions of the pellets, cause I totally forgot, but the ice pellets and gravity pellets are also worth more than the regular pellets (not by anywhere near as much as the fire pellets, but still a bit - I think its 4x).
Also, the amount of money you make for each bigger loop is multiplied by 10 (multiplicative, so the third loop is 100x compared to the first), but for some strange reason I never added any sort of UI element or anything like that to display it to the player, so I guess you were just sorta supposed to figure that part out (and I totally understand if you didn't)
The yellow pellets (or golden pellets, as I called them) aren't ever explained, so I completely understand the confusion, but they are literally just regular pellets but worth 15x more, which I probably should've included in the description of the game somewhere or something like that (or maybe a UI popup when they first show up - something to inform the player).
I completely understand all your criticism and it's all completely fair! Thanks for taking the time to play and share all your feedback :)