Yup. I did exactly all that, and use the tool as linked.
Could that be an issue related with DraStic license verification? I heard once that a certain Google Play Store version causing some troubles. There is a topic about that on reddit with this thread "[CRITICAL BUG] In Google Play Store 10.7.17+ - LVL (License Verification Library) is not working" So maybe it is an issue with your Play Store version. Or maybe you can check out this thread "Won't load past startup r2.5.0.3a" on official DraStic Forum and see if there is any useful information that might help you case. Or even better, create a thread and ask for support since you have a paid version.
furthermore;
Have you try some other games on that paid version of your DraStic? If yes, did they worked?
Can you try uninstalling your DraStic and have clean install then try the game again.