Thanks for trying it out =)
The speeds are poorly tweaked, that is very true, but I hadn't thought about wanting to avoid doing it because it messes up the following block... I should probably fix it so that you'll need to press down again in order to drop the next block.
You are supposed to work the numbers from top to bottom (or in the case of elimination games, you can pick any), it is mentioned in the tutorial but the feedback for this is poor - especially since the number is popped the moment you complete the operation and not when it actually disappears. I might allow the player to use any of the numbers in the list in order to allow for more options and counter the problem of waiting for specific blocks, and try and make the feedback more obvious.
And about the operation in the screenshot, it follows
standard operator precedence and is thus always 43, but as I mentioned the result gets removed from the list when the operation is created and not when the blocks disappear.
The game has really poor production values since I threw it together in a day to try out the concept, and the reason I'm posting it here is because I'm not sure if it is worth working more on or not. Again, thank you for your feedback