Hi @Ans I have looked at this level. Its not impossible but you will need a lot of luck and falling crops. If you hit a grass seed with a shovel, it can grow grass without having to swap it with a water drop. You need to make as much grass as you can and if you are really lucky and get a grass seed next to the slime (that is especially helpful to use a shovel on it) you can cancel the slime with new grass. If you can cover as much slime as you can, it means less grumpy crops. You are going to have to rely on falling crops though where matches make themselves after the first match you make.
We can also ask @MarkHawk if he has any other complaints about this level and if he has, maybe pass feedback back to the studio?