NecroMerger is an idle/merger game by Grumpy Rhino Games. It has in-app purchases (gems, gold, offers) and an online save system. Lucky Patcher is a tool that sometimes can remove Google Play license verification or emulate in-app purchases on older/offline games.
Instead of cheating, learn optimal merging: necromerger luckypatcher
Even if you get Lucky Patcher to run, you may break essential game mechanics. For example: NecroMerger is an idle/merger game by Grumpy Rhino Games