v0.51, Upgrades shop fix and quality of life — Phyto Steam update #1312547

. level unlocked until map 29 . you won't have to replay the last map when next maps will be added in future updates . add icons in game, replacing plants and flowers sprout, when it's not unlocked, to show players it can be purchased . fixed incorrect description texts . removed texture flashing of fruit, which was too intense . a refresh error allowing overpriced upgrades to be purchased has been fixed . the plant "chewer" had its damage and slow effect a bit down, it was too high, this type of plant supposing to be a support role