This game made me feel really stupid.... and then really clever.... and then really stupid again 😅. It was fun and engaging and I spent quite a bit of time on it. Unfortunatly my best run was cut short because i clicked the "PEDMAS" title, not realising it would send me back to the menu!
The mechanics were really well implemented and i dont think i found even a single minor bug in the whole time i played. I thought the attack & defence mechanic was really good and lead to a sort of risk v reward mechanic of choosing which to prioritize. Having the doom counter tick down in the background was a great idea to disentivice just sitting on the defensive!
The randomness was a little frustrating, however i think adding in the special dice/powerup mechanic helped counter that a lot. I felt like i coudl counter the RNG by strategically picking upgrades to enpower the player to try and mitigate it (I ended up picking a lot of extra maths dice cause the pesky '+' dice never seemed to want to show up!)
The graphics were simple but complimented the game well and didnt distract from the gameplay. I thought the little effect of the dice shaking when you rerolled was great and really added some nice weight to the action. I think more bits of polish like this would be really impactfull and help sell the solid core you have here.
Other than that you have already identified what would be great to tackle with this next in the settings menu :) I agree with most of them but actually think adding more functions (like brackets) would over complicate it. I think with some balancing and differnt enemy mechanics the core +=/* really provides enough, especially if you dial in the difficulty ramp!
Great entry, i really enjoyed my time with it and am impressed you managed to squeeze making a roguelike into 2 weeks! nice job!
(Ohhh and i guess the other problem is im team BODMAS all the way! down with PEDMAS!!! though i liked what you did with the acronym)