I had forgotten about this game, but recently I noticed someone logged an even better score a while ago on my version of this game. The maximum score afaik is 127241744 by going in a spiral like so:
+--+--+--+--+--+--+ | 1| 2|31|29|28|27| +--+--+--+--+--+--+ | 3| 4|32|30|26|25| +--+--+--+--+--+--+ | 5| 6|34|33|24|23| +--+--+--+--+--+--+ | 7| 8|36|35|21|22| +--+--+--+--+--+--+ | 9|10|13|16|18|20| +--+--+--+--+--+--+ |11|12|14|15|17|19| +--+--+--+--+--+--+I've also uploaded my version to itch see here https://bdrgames.itch.io/hexasum