This was a fun, little experience with a game that has a very simple task: scare/kill ghosts off with the power of the cross. I enjoyed the thunderstorm sound in the background because it added a nice contrast between the realistic sound and the more minimalist game design. I admit ghosts are cute as heck, one thing I didn't understand was the sentence said by the priest "stesa???" oh well, I would like to share tips on how to get both medals based on my personal experience:
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The first, and most important, requirement to get them is getting the pop-up when the game starts after you clicked on "play". The way the login for the medal API was implemented can make the unlocking a bit difficult and I had to close and re-open the browser to test it and get it. Without this pop-up, you don't get the medals.
So after this crucial step is done, let's talk about the two medals. I've noticed that you can click many times to get more points, and after I reached and even surpassed 50 points, which equals to the number of killed ghosts, I saw in-game "you unlocked boo man killer", but the medal didn't unlock. So I kept clicking many times on the same ghost (I may suggest an auto-clicker to increase in a fast way the number of points in a single ghost) until I reached and surpassed 999. If I recall well I got 1012 ghosts killed, and despite I didn't see any in-game message telling me I got "The GAMER" achievement, I could see it in the game medal section that it got unlocked.
I found it funny that I unlocked first the 100 points medal and only today the 50 points medal, but something told me the reason: I have to reach exactly 50 points in order to really unlock it. So to sum up:
-boo man killer
click only one time on the ghost that is about to approach you, ignore those who don't disappear once you clicked on them (it can happen sometimes), and keep clicking one time on each ghost that appears. You can keep track of it by looking at the points. Avoid clicking on the brown, floating thing because it will kill you instantly.
-The GAMER
Use an autoclicker in case you want to speed up the process, but you can normally click with your finger too, the result doesn't change. Clicking many times on the same ghost gives you extra points and the game reads it as more killed ghosts. Resist, avoid the brown, floating "ghost" (I don't know what it is, sorry^^'), keep clicking until you reach and surpass 999.
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Besides these tips, it was a fun game, maybe adding levels, or more challenges, or even making ghosts faster the more you go on would increase the re-playability of the game that finishes once one gets the medals. Cute job!