I'd first like to say that I congratulate you on your process in the development of this revolutionary game. This will satisfy my gaming addiction through the many long and boring math classes that I am required to take. Thank you for creating this but, I do have a couple of questions and suggestions.
First off: Action Keys
As a player I find it very awkward to use both the Enter and Esc keys as they are located on the opposite side of the TI-89 calculator. I know people have already recommended using the 2nd and Alpha key but if you don't want to implement those I suggest the F1 and F2 keys on the calculator. Maybe F5 for quick escape, F3 for start, or F4 for select. I find this keys a lot easier to use then the arrangement you have at the moment. You may have seen this arrangement used in the popular Advance Wars spin off CalcWars.
Secondly: English Version
French is such a beautiful language to read but for a majority of people English is their primary language. I think this would also help the game reach a larger audience. I understand that the coding of the original French version is hard enough but it would be nice have a download to the even partially finished English Version.
P.S.For I am English and the world obviously revolves around me. Thirdly: Game Over Screen
As I see right now the Game Over screen takes you directly out of the game. I find this very inconvenient when I am wanting to play your game. I would suggest just taking it back to the title screen. But that is just me because I'm lazy. A lot of people probably don't mind.
In conclusion, I commend you for remaking this extraordinary game and from what I see the code seems to be very well written. Keep up the good work and I hope you'll be able to finish it. If you need any testing help feel free to ask. I can also proof read the English translation if the translator isn't a native speaker.
Sincerely
MM
P.s.s. I made an account just to make this comment